Compression in C# - C# Discussion Boards

ComboBox - Item Selection

11-Sep-03 5:35

There is a find/replace dialog in the Genghis project[^]
Hope this helps

- Kannan

MrEyes11-Sep-03 3:22

MrEyes

11-Sep-03 3:22

I am sure this question has a simple answer and when I see it I will scream like a girl, but such is the way of things.

I have a ComboBox (cmbImportance) which is populated from a dataset with the following code :

cmbImportance.Items.Clear();
cmbImportance.ValueMember = "id";
cmbImportance.DisplayMember = "level";
cmbImportance.DataSource = ds.Tables[0];

This gives me a ComboBox with these values :
Critical (Selected)
High
Normal
Low

So far so good, the thing is this combo is also used to display properities that somebody has previously selected and may want to edit - if the form is displaying previously selected values I use the following code to select the users previous selection

if (edit_view)
{
  cmbImportance.SelectedItem = user_prefs.importance;
}

Which all seems relatively simple, but lets assume that the previously selected importance is "Normal" what happens is that I end up with a combo box with the following values :

NormalCritical (selected)
High
Normal
Low

Obviously the 'NormalCritical' select object is wrong, but I cant work out why it is doing this - I have tried used SelectedText as well and it did the same thing.

Re: ComboBox - Item Selection

MrEyes11-Sep-03 4:23

MrEyes

11-Sep-03 4:23

I have found a solution to this little problem, and that is to use this code to select items instead :

cmbImportance.SelectedIndex = cmbImportance.FindStringExact(user_prefs.importance);

Which is all well and good, but I am lost as to an explaination of why this works and the other method did not

Re: ComboBox - Item Selection

tsigo11-Sep-03 12:51

tsigo

11-Sep-03 12:51

What about

cmbImportance.SelectedItem = cmbImportance.Items.IndexOf(user_prefs.importance);

It's neither acute or grave....

bobhoskinsbrother11-Sep-03 0:44

bobhoskinsbrother

11-Sep-03 0:44

I've written a quick and dirty image object that accepts parameters along the url to generate either a resized image or captions.

It takes parameters something like this:

The problem, which is a ticklish one, is that it seems to strip out the acute and graves from the end image, leaving nothing in it's place.
In the codebehind I've specified:
myGraphics.DrawString(Caption, CaptionFontFamily, new SolidBrush(CaptionColour), CaptionXRegister, CaptionYRegister, new StringFormat(StringFormatFlags.NoFontFallback)); to ensure that the characters won't be substituted with anything else. This has not resolved the problem. Been looking for a couple of hours for the answer to no avail. I've also tried setting the culture in the web.config file by the way...

Any ideas would be much appreciated

As I thought that C# uses UTF8 by default, this is indeed confusing me....

Confused | :confused:

Re: It's neither acute or grave....

Daniel Turini11-Sep-03 1:12

Daniel Turini

11-Sep-03 1:12

HTTP uses a special encoding for some chars, e.g., accented chars. When the browser is sending the GET request for the image, it's probably messing up with the char.
See the MSDN documentation for HttpServerUtility.UrlEncode or HttpUtility.UrlEncode methods.

You can do it on anything you choose - from .bat to .net - A customer

Compression in C#

Stephane David10-Sep-03 23:27

Stephane David

10-Sep-03 23:27

I need to create a "package" including some pictures, sounds, and ini file.
My first idea is top compress all of themp into a zip file, change the extension to .app.

I would need to do it programatically in C#, and be able to access a given file in the zip. For instance, read only the ini to get some general information, and list the contents of the package, and then open the package when asked.

Is it possible?

Re: Compression in C#

Daniel Turini11-Sep-03 1:08

Daniel Turini

11-Sep-03 1:08

Yes:
http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx

You can do it on anything you choose - from .bat to .net - A customer

Re: Compression in C#

Kannan Kalyanaraman11-Sep-03 5:49

how to prevent window close by clicking window close button

11-Sep-03 5:49

Yes it is possible.
Check out this[^] article on msdn.

The only problem is when you ship the application you need to ship the vj# redistributable.

- Kannan

Re: Compression in C#

leppie11-Sep-03 7:26

leppie

11-Sep-03 7:26

Look at my Bzlib managed wrapper article right here on CP!

leppie ::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.

zecodela10-Sep-03 23:04

zecodela

10-Sep-03 23:04

hi,
any method prevent the window close when user click the "little cross" button at the right top corner of the window.
in other word, would i can to get the window close message invoke by the "little cross" button? so, i can re-route the message to prevent window close.

anyone would help?

thanks,
jim

Re: how to prevent window close by clicking window close button

Stephane David10-Sep-03 23:22

Stephane David

10-Sep-03 23:22

I'm not sure of the exact syntaxe because I don't have Visual Studio .Net installed. But you can simply select the event closing (I hope it's this one). Then, in the event arg, you can simply use

e.Cancel = true;

to cancel the event, i.e. prevent the window close.

Of course, you could also remove the "little cross" button.

Re: how to prevent window close by clicking window close button

Furty10-Sep-03 23:23

Furty

10-Sep-03 23:23

First subscribe to the Closing event:

this.Closing += new System.ComponentModel.CancelEventHandler(Form_Closing);

Then use the CancelEventArgs.Cancel property to abort closing:

private void Form_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
   e.Cancel = true;
}

Re: how to prevent window close by clicking window close button

Nick Seng10-Sep-03 23:25

Re: how to prevent window close by clicking window close button

10-Sep-03 23:25

Use the OnClosing event to do it.

private void Form_OnClosing(object sender, System.ComponentModel.CancelEventArgs e)
{
    e.Cancel = true; //prevents the form from closing
}

Support Bone

sumeat11-Sep-03 14:57

sumeat

11-Sep-03 14:57

private void Form_OnClosing(object sender, System.ComponentModel.CancelEventArgs e)
{
e.Cancel = true; //prevents the form from closing
}

This will prevent the form from closing ever!!!!! You do want the user to close the form somehow if not by clicking on the "cross"??

Re: how to prevent window close by clicking window close button

Nick Seng11-Sep-03 15:22

Re: how to prevent window close by clicking window close button

11-Sep-03 15:22

This is just a sample. I'd assume zecodela would know enough to put some conditional statements in there before setting e.cancel to true.

Support Bone

Jim Stewart11-Sep-03 15:06

Jim Stewart

11-Sep-03 15:06

I would like to remind you that your users will expect to be able to close their windows this way. It seems to me to be a big violation of good GUI principles to proceed this way. I would suggest that it would be far better to disable (probably difficult) or not show the close box. In this way, your users won't be confused with the lack of function.

α.γεεκ

Fortune passes everywhere.
Duke Leto Atreides

Unmanaged Enumeration values

Nick Seng10-Sep-03 21:45

10-Sep-03 21:45

I'm having some problems getting the values of some unmanaged enumerations.
For example, calling NetServerEnum returns me a int value of 234 in C#, but I'm not sure which one of the possible enumeration value it is(ie. ERROR_MORE_DATA, or ERROR_NO_BROWSER_SERVERS_FOUND, etc.)

can anyone point me to the direction when I can get the values of any unmanaged enumerations?

Support Bone

Kannan Kalyanaraman10-Sep-03 22:09

10-Sep-03 22:09

Someone has taken the pain to have a declarations and constants of Win32API for usage in .NET.
You can get them here[^], I think it is in VB but should be useful nevertheless.

- Kannan

Nick Seng10-Sep-03 22:22

10-Sep-03 22:22

Thanks, that was a cool tool. Unfortunately, It defines only 4 enumerations. Frown | :(

Support Bone

Nick Seng10-Sep-03 22:30

10-Sep-03 22:30

Ack, sorry. I've found that the values I wanted are under Constants, not Enumerations. So, it is a fantastic tool after all. Big Grin | :-D

Thanks again.

Support Bone

Kannan Kalyanaraman10-Sep-03 22:34

10-Sep-03 22:34

I was thinking that you should be really unlucky if you are not able to get your enum in that 55k odd available there... Smile | :)

Anyway, its a very handy tool to have when you are doing lot of interop Smile | :)

Regards,
Kannan

C # API

Ritesh Dubey10-Sep-03 19:25

Ritesh Dubey

10-Sep-03 19:25

Where i Can get C # API

I need to work on Image Processing

Want to select an Image and change the color of selected region

HELP REQ

Ritesh Dubey

Re: C # API

Kannan Kalyanaraman10-Sep-03 22:06